Hi all,
I am running RTLinux 3.1 on Linux 2.4.18 (+Gearheart patch) on a Pentium
3 933 MHz machine. Running the sample program "measurements" gives me
numbers I cannot explain:
... start tasks, good latency ...
min: 0, max: 1664
min: 0, max: 2080
min: 0, max: 1856
min: 0, max: 1472
min: 0, max: 1472
... start X/GNOME, bad startup latency, levels off ...
min: 0, max: 879616
min: 0, max: 24096
min: 0, max: 1312
min: 0, max: 1824
min: 0, max: 27872
min: 0, max: 36928
min: 0, max: 41440
min: 0, max: 49984
min: 0, max: 23584
min: 0, max: 8064
min: 0, max: 15296
min: 0, max: 2208
min: 0, max: 25024
min: 0, max: 6912
min: 0, max: 12032
min: 0, max: 6848
min: 32, max: 2144
min: 0, max: 4640
min: 0, max: 2240
min: 0, max: 3936
min: 0, max: 2976
min: 0, max: 6048
... start "while :; do cat /dev/null; done", periodically bad latency ...
min: 0, max: 35104
min: 32, max: 34272
min: 0, max: 41152
min: 0, max: 652608
min: 32, max: 35360
min: 32, max: 32000
min: 0, max: 36544
min: 0, max: 801472
min: 0, max: 33856
min: 64, max: 30560
min: 0, max: 33984
min: 0, max: 758240
... kill X, horrible latency spike ...
min: 64, max: 41440
min: 0, max: 34176
min: 0, max: 656128
min: 0, max: 997700192
min: 992320, max: 997472
min: 32, max: 997504
min: 0, max: 30496
min: 0, max: 32288
min: 0, max: 29248
My hope was to see consistent numbers <= 50,000 ns. I assume that there
is either an error in my configuration or in my understanding of the
numbers that "measurements" is giving me. Can someone shed some light
on this? I have played with the flags in rt_proccess.c but have similar
results. Also, what kind of latency should I expect on a machine like
this? The RTLinux papers I have read use older computers.
Thanks,
--
Andrew Gaul
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